Drawing mechanism



June 12. 1956 E. TOENNIESSEN 2,749,575

DRAWING MECHANISM Filed Jan. 11, 1952 2 Sheets-Sheet 1 ERNST75ENMIE$EN /m-wrop {M EW JZM/ A770 Ali-1% June 12. 1956 E. TOENNIESSEN DRAWING MECHANISM 2 Sheets-Sheet 2 Filed Jan. 11, 1952 United States Patent This invention relates to drawing mechanisms, more particularly for fl-yers, and-has for; its, object-to improve drawing mechanisms of that type in which the cap bars or holders. fonthe upperor; pressure rollers are fastened near their forward ends-tova; barwhich extends in parallel direction to. the rollers: and; is: inserted, into. slots of the rollers; stands'which; arev supporting the lower rollers of the: drawing mechanism,

Indrawing mechanisms inswhich the pairs of drawing rollers. are cooperating with lower aprons, it has already been proposed. to, fix the cap. bars or top roller holders with their forward: ends, to. the apron reversing bar extending through; the; drawing frame. In such. an. arrangement, however, it isv difiicult to. lift the top; roller holders and to take; them out'cofthe frame in; such manner that several holders are lifted in sections at same time, as this lifting isfpreventedr'by the aprons, thus needing at first to remove at least some of the. top. roller holders and the aprons, before the. apron. reversing bar can be taken out of the frame: 'Removal of the-aprons, however, needs a disengagement of' thelower rollers and therefore is a tedious and? difficult operation.

The present invention has forits chief object to avoid these difliculties" by fastening the top roller holders to a supporting bar which is uncovered by aprons and can be lifted a nd removed from the roller stands together with all top roller holders fixed thereto without foregoing removal of any; individual top roller holder and without foregoing disengagement ofany lower rollers from their bearings.

Afurth'er object or the invention is to construct the bar supporting the top roller holders in such way as to be secured against longitudinal displacement and against uncontrolled lifting by simple means which do not impair the fast andsimple operation for the removal of stop roller holders.

A still further object of the invention is to use the bar supporting thetop roller holders for additional supporting fix sliver guides.

Moreover, for the special construction of weighting means for pressing the upper rollers toward their cooperating lower rollers which can be used for drawing mechanisms of the type referred to, the invention provides improvements by which it is possible to vary the transfer of weight to the different top rollers and to prevent the weight transferring stirrups from tilting sidewards when they are removed from the weight transferring saddles.

These and further objects will be readily understood from the following description of a drawing mechanism represented as a preferred form of the invention in the drawings, in which show:

Fig. l a cross-section in the region of a stand or bracket through a four-roller flyer drawing frame,

Fig. 2 a cross-section taken at the weight-applying place of the top rollers with suspended weighting,

Fig. 3 the same cross-section with the curved weightapplying member in the releasing position,

2,749,575 Patented June, 12,; 1956 Fig. 4' a front view of the drawing frame in longitudinal section on line IV-IV of Fig. l.

1, I are the-delivery rollers, 2, II- and- 3, III'two, pairs of drawing rollers and 4, IV feed rollers. The bottom rollers I, II are supported in stationary cut out bearing places of the bracket 5, the bottom rollers; III, IV separately on bearing slides 6, 7, whichslide; along the. guide 8iof the bracket and can be fixed to it-by rneans ofscrews 9, 10: The sliver 11 runs through a rockable feed funnel 12 in between the feed rollers 4, IV, then passes a first draft field between the rollers 4, IV to 3, III, thereupon a second draft field between the pairs of rollers 3, Mind 2, II and finally a condenser field between the pairs of rollers 2, II and 1, I. The top rollers 1, 2, 3, 4. are sup.- ported at lateral bearing slots of; top roller holders 13. A plurality of adjacent top. roller holders, are fixed with their forward ends between the roller pairs'l, I;, 2, H- by means of screws 14 to a holder rail: 1-5 which extends through the drawing frame in the direction of the roller axes and is inserted in comparably deepnotches 16 of thebrackets with a sliding fit, so as to be capableof'being lifted'out. In each case the top roller holders lying between two adjacent brackets together with a top' roller holder lying above a bracket are to be' fixed to a portion of the rail 15 to form a holder section. This portion is to be secured with one endby. a fixing pin 17' to. a bracket against longitudinal displacement. The 'fixing pin may, for instance, be formed by the end of the screw 14 which extends through the top roller holder 13 and the holder rail 15v and with its end 17 fits into. a bore 18 of the bracket. The other end of the portion of the holder rail- 15 is preferably provided with a bevel 19. whichv acts as an abutment and engages under the similarly bevelled end of the adjacent holder rail and is thereby secured against being lifted off upwards. The top roller holders lying above the brackets are further secured against lifting out by a locking spring 20. This locking spring is fixedby means of a screw 21 to the bracket and engages over the associated top roller holder with a projection 22.

The top roller holders 13 have at their unsupported rear ends a guide shaft 23, on which two separate holders 24-, 2:5 for the top rollers 3, 4' are slidable and fixa-ble by means of screws. 26;. By displacing the bearing slides, 6., 7 and the separate holders 24, 25 the distances of the nipping points in the draft fields can be altered and adjusted to suit the length of fibre in each case.

The holder rails 15 at the same time act as supports for condensers 27 which are permanently fixed to the holder rail. or may be removably mounted on them. The feed funnels 12, are mounted on, arail 41 which is. let into; a

rear- $101.42.. of the. bearing, slide. 7- and. extends. through the drawing frame in the longitudinal direction of the rollers.

The top rollers 2, 3, 4 are provided with saddling means consisting of two saddles 28, 29 which are displaceable with respect to one another. The displaceability of 28 on 29 makes it possible to retain the same saddle arrangement, even when the distance between rollers is varied, the slot 29' being made so long so that 28 can also be brought into the position shown in dotted line, in which III is relieved of load and only IV is loaded. This is suitable, for instance, for long staple fibres, in which case the unweighted top roller 3 acts as draw through roller.

The saddling is placed under pressure by a curved weight-applying member 30 which in the weight-applying position according to Fig. 2 bears with a pivoted lever 31 on the saddle 29. The curved weight-applying member 30 engages round the drawing frame, but has only a relatively small overhang to the back, as it is not required to extend round a rear pivotally shaft of the top roller holders. The lower end 32 of the weight-applying memher is flattened on both sides and engages in the manner of a hook in the attaching eye 33 of the tension hook 34 which extends through the roller beam 35. The attaching eye 33 of the tension hook has two lateral abutments 36 which engage round the flattened end 32 of the curved weight-applying member so closely that the curved member in its released position according to Fig. 3 will remain in an almost erect position and Will not tilt over laterally in the direction of the double arrow 37 (Fig. 4). In its released position the curved member will lay itself over only slightly backwards and will find an abutment against a stop 38 of the attaching eye. The upper end of the curved member 30 with the hinged lever 31 will therefore only give slightly towards the back and will remain easily accessible from the front.

The tension hook 34 is provided at its end extending through the roller beam with a thread and carries a supporting socket 39 which in the releasing position of the curved weight-applying member 30 rests with its flange on the roller beam 35. The supporting socket 39 is adjustable on the thread of the tension hook and can therefore, in the case of different diameters of the top rollers 2, 3, 4, different spans or expansions of the curved mem bers 30, be so adjusted as required in its position as to be always at a desired, uniform distance above the roller beam, when the curved member 30 occupies its weightapplying position according to Fig. 2. The uniform distance of the tension hook 34 above the roller beam 35 is also necessary, in order that the motion of the curved member 30 backwards, on the load being removed, shall remain limited to a minimum and also that the elfort required in applying and easing the weight (Fig. 3) shall be considerably less than hitherto.

When the drawing frame is to be relieved of weight, all that is required is to tilt the pivoted levers 31 of the curved weight-applying members 30 upwards. The curved members will then of themselves drop slightly backwards, being at the same time, however, guided by their attaching eyes 33, 36 and remaining in an almost erect position, without falling into the adjacent slivers and tearing them through or coming in contact with the gear part 40 behind the roller beam. When the top roller holders 13 are to be lifted out, it only necessary to bend back a locking spring 20 so far that it releases the top roller holder disposed above the bracket. This top roller holder has then only to be raised and slightly displaced laterally, so that the holder rail 15 is freed at the other end with its bevelled abutment 19 from the adjacent holder rail, whereupon all holders supported on the rail 15 can be lifted together with the rail out of the drawing frame.

The invention is not restricted to constructional details. The curved weight-applying members 30 can also, for instance, extend round the drawing frame to the other side. Similar saddling means with means for securing the curved weight-applying members against lateral tilting Cir can also be used in drawing frames for ring spinning mechanisms.

What I claim is:

l. A drawing mechanism in textile spinning frames, particularly for use in fiyers, comprising in combination a plurality of pairs of top and bottom drawing rollers, a plurality of roller stands supporting the bottom rollers, removable top roller holders provided with vertical hearing slots for receiving the spindles of the top drawing rollers, each roller stand having associated one top roller holder located above the stand and at least one further top roller holder located between two neighboured roller stands in spaced relationship thereto, said roller stands having a vertical slot between the foremost and the next following roller provided for receiving a holder supporting bar extending parallel to the bottom rollers and having fixed thereto those top roller holders which are located between the roller stands without having a stand associated thereto, said vertical slots of the roller stands and said holder supporting bar inserted therein extending over the entire width of the roller stands, those top roller holders located above roller stands being fixed too to the holder supporting bar by means of screws each extending from above into the holder supporting bar and fitting with a smooth lower end into a smooth bore of the roller stand.

2. A drawing mechanism according to claim 1, in which the holder supporting bar is divided over its length in sections extending from one to the next roller stand, said sections of the holder supporting bar being provided at one end with a lower projecting abutment and at the other end with an upper projecting abutment, said lower abutment fitting within the slot of the roller stand under the upper abutment of the adjacent holder supporing bar section.

3. A drawing mechanism according to claim 1, in which those top roller holders which are located above the roller stands, each are secured in position by means of a locking spring, said spring being fixed to the front end of a roller stand and having an upper projection extending towards behind and fitting removably over the front end of the associated top roller holder.

4. A drawing mechanism according to claim 1, in which the holder supporting bar is divided over its length in sections extending from one to the next roller stand, said sections of the holder bar being of rectangular cross section and having at one end a lower projecting abutment, at the other end an upper projecting abutment, said lower abutment fitting within the slot of the roller stand under the upper abutment of the adjacent holder supporting bar section, each of said sections being provided with sliver conducting and guiding means such as sliver condensers fixed to the bar sections at points between two neighboured top roller holders and in spaced relationship thereto.

No references cited 

